Slimming a DC Direct 13"?

I opted for a DCDirect 13" figure fir a custom--I wanted something taller than a GIJoe, and cinsiderably more muscular. Unfortunately, I haven't bewn able to make some decent pants--Joe pants aren't big enough around the thighs and hips. I was able to shave the feet down so a standard Joe boot would fit, so I'm wondering if I can also slim the thighs? Has anyone dine this, or is the plastic too thin and I'll end up with holes?